Provided you don't damage it removing it, it's quite in order to reuse the hub nut. I certainly do (though that's no guarantee of anything). It is a 'stiff nut' so you wouldn't want to keep re-using it but once or twice is fine. You're correct in principle of course, some of these hub nuts are single use. I think the Ford multilayer one is a single use item.
It is handy having air in the workshop. I put off installing air in my (domestic) workshop for some time as it is quite an investment. Also I don't have a 3 phase supply and using a domestic single phase supply does limit the size of the motor which in turn limits the free air delivery (FAD) of the compressor. Also decent air tools cost a lot of money. You can buy cheap rattle guns but they don't deliver much torque and that combined with limited FAD means that they are limited in what they can do. Most of the work I do is with normal hand tools but air is very useful to have if you want to wizz the lug nuts off, reach for the air cut off tool, inflate tyres, wizzing the nuts off corroded bolts, blast debris out of the plug cavities before removing the plugs and so on. Now I've installed air I wouldn't be without it.
HTH
Tim
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